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Lead service lines -- the pipes that carry water from the public water main to a building -- were installed in the U.S. as late as the 1980s, making them an ongoing, if silent, hazard to drinking water supplies. This map is based on recent survey work by the Natural Resources Defense Council but likely underestimates the problem significantly given that many states do not track the use of lead pipes. Illinois and Ohio reported the most lead service lines still in use. assets.nrdc.org/sites/default/files/styles/full_content--retina/public/media-uploads/nrdc_edt_leadpipe_map_final_2.png
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